HSPT Math : How to find the measure of an angle

Study concepts, example questions & explanations for HSPT Math

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Example Questions

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Example Question #1 :How To Find The Measure Of An Angle

What is the sum of the interior angles of a triangle?

Possible Answers:

Correct answer:

解释:

The sum of the three interior angles of a triangle isdegrees.

Example Question #1 :How To Find The Measure Of An Angle

Two of the interior angles of a triangle measureand. What is the greatest measure of any of its exterior angles?

Possible Answers:

It cannot be determined from the information given.

Correct answer:

解释:

The interior angles of a triangle must have measures whose sum is, so the measure of the third angle must be.

By the Triangle Exterior-Angle Theorem, an exterior angle of a triangle measures the sum of its remote interior angles; therefore, to get the greatest measure of any exterior angle, we add the two greatest interior angle measures:

Example Question #2 :How To Find An Angle Of A Line

Two angles are supplementary and have a ratio of 1:4. What is the size of the smaller angle?

Possible Answers:

3.6^{\circ}

72^{\circ}

45^{\circ}

144^{\circ}

18^{\circ}

Correct answer:

3.6^{\circ}

解释:

Since the angles are supplementary, their sum is 180 degrees. Because they are in a ratio of 1:4, the following expression could be written:

x+4x=180

5x=180

x=36^{\circ}

Example Question #1 :How To Find The Measure Of An Angle

In a given triangle, the angles are in a ratio of 1:3:5. What size is the middle angle?

Possible Answers:

20^{\circ}

90^{\circ}

45^{\circ}

75^{\circ}

60^{\circ}

Correct answer:

60^{\circ}

解释:

Since the sum of the angles of a triangle is180^{\circ}, and given that the angles are in a ratio of 1:3:5, let the measure of the smallest angle be, then the following expression could be written:

x+3x+5x=180

9x=180

x=20

If the smallest angle is 20 degrees, then given that the middle angle is in ratio of 1:3, the middle angle would be 3 times as large, or 60 degrees.

Example Question #1 :Triangles

The measure of 3 angles in a triangle are in a 1:2:3 ratio. What is the measure of the middle angle?

Possible Answers:
90
3.0
45
60
Correct answer:60
解释:

The angles in a triangle sum to 180 degrees. This makes the middle angle 60 degrees.

Example Question #1 :Use Variables To Represent Numbers And Write Expressions: Ccss.Math.Content.6.Ee.B.6

Call the three angles of a triangle.

The measure ofis twenty degrees greater than that of; the measure ofis thirty degrees less than twice that of. Ifis the measure of, then which of the following equations would we need to solve in order to calculate the measures of the angles?

Possible Answers:

Correct answer:

解释:

The measure ofis twenty degrees greater than the measureof, so its measure is 20added tothat of- that is,.

The measure ofis thirty degrees less than twice that of. Twice the measure ofis, and thirty degrees less than this is 30subtracted from- that is,.

The sum of the measures of the three angles of a triangle is 180, so, to solve for- thereby allowing us to calulate all three angle measures - we add these three expressions and set the sum equal to 180. This yields the equation:

Example Question #3 :How To Find The Measure Of An Angle

Call the three angles of a triangle.

The measure ofis forty degrees less than that of; the measure ofis ten degrees less than twice that of. Ifis the measure of, then which of the following equations would we need to solve in order to calculate the measures of the angles?

Possible Answers:

Correct answer:

解释:

The measure ofis forty degrees less than the measureof, so its measure is 40subtracted fromthat of- that is,.

The measure ofis ten degrees less than twice that of. Twice the measure ofis, and ten degrees less than this is 10subtracted from- that is,.

The sum of the measures of the three angles of a triangle is 180, so, to solve for- thereby allowing us to calulate all three angle measures - we add these three expressions and set the sum equal to 180. This yields the equation:

Example Question #1 :How To Find The Measure Of An Angle

Two interior angles of a triangle adds up todegrees. What is the measure of the other angle?

Possible Answers:

Correct answer:

解释:

The sum of the three angles of a triangle add up to 180 degrees. Subtract 64 degrees to determine the third angle.

Example Question #2 :How To Find The Measure Of An Angle

What isof the measure of a right angle?

Possible Answers:

Correct answer:

解释:

A right angle has a measure of. One fifth of the angle is:

Example Question #2 :Solve Simple Equations For An Unknown Angle In A Figure: Ccss.Math.Content.7.G.B.5

What angle is complementary to?

Possible Answers:

Correct answer:

解释:

To find the other angle, subtract the given angle fromsince complementary angles add up to.

The complementary is:

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