All About Triangles!!

Classify Angles

100

Angles that are greater than 90 degrees

Acute Angles

200

Angles that are equal to 180 degrees

What is supplementary angles

300

Angles that are equal to 90 degrees

What is right angles

Complementary

400

Angles that are greater than 90 degrees but less than 180 degrees

What is obtuse angles

500

The number of degrees in a triangle

What is 180 degrees

Types

100

Triangles that have all sides equal

What is equilateral triangles

200

Triangles that have two equal sides

What is isosceles triangles

300

The little box in the corner of a triangle or any figure represents what?

What is a right angle?

400

What is the name for pairs of opposite angles formed by two intersecting lines?

What are Vertical Angles

500

Find the measure of angle Y

62

Finding Angle Measures

100

Two sides of a triangle measures of a triangle are 23 and 14. Between what two numbers must the third side be?

23 - 14 = 9

23 + 14= 37

9<x<37

200

Two sides of a triangle measures of a triangle are 12 and 6. Between what two numbers must the third side be?

12 - 6= 6

12 + 6= 18

6<x<18

300

The interior angles of a triangle are "x" degrees, "x + 70" degrees and 28 degrees. Find the value of x.

41

400

Angle A = 2x + 3 and Angle B = x form a right angle. Solve for x and find each angle measurement. 

2x + 3 + x = 90

3x + 3 = 90

x = 29

Angle A = 61 Angle B = 29

500

What is the measurement of angle B?

<B = 39^o 

Solve for X

100

The value of x

x = 72 

200

Measure of angle X=60 Measure of angle Y=40 What are the measures of the missing angles W and Z?

Measure of angle W=100 Measure of angle Z=80

300

The value of x 

x = -11

400

Solve for x.

 

x = 49

500

The values of x and y 

x = 5 

y = 10

Triangle Inequalities

100

What is the missing angle?

75 degrees.

200

Are these possible lengths for a triangle: 47,28,70. Explain your reasoning

Yes, the two smaller sides added together are still bigger than the largest side by itself 

300

Are these possible lengths for a triangle: 40, 40, 80. Explain your reasoning

No because the two shorter angles has to be bigger than the larger one. They cannot be equal.

400

Find the range of values possible for the missing side of a triangle if the other two sides are 11 and 8 

3<x<19

500

Angle A and C are vertical angles. Angle A = 11y-36 and Angle B = 63. Find the measure of Angle A.

11y-36 = 63

11y = 99

y = 9

Angle A: 63 degrees.