Triangle Missing Angles 7.11C

The measures of the angles of a triangle are given.

-The measure of angle A is (x + 4)°

-The measure of angle B is twice the measure of angle A.

-The measure of angle C is equal to the measure of angle B.

What is the value of x?

• 32

• 41

• 86

• 68

The perimeter of a rectangle is 32 inches.

-The rectangle has a width of 4 inches.

The rectangle has a length of 2.5x inches.

Which equation can be used to find the value of x?

• 4 + 2.5x = 32

• 8 + 5x = 32

• 4(2.5x) = 32

• 8(5x) = 32

Angle F and angle H are supplementary angles. The measure of angle F is 77°. The measure of angle H is (5x + 18)°. Which equation can be used to find the value of x?

• 77 = 5x + 18

• 77 + (5x + 18) = 180

• 77 + (5x + 18) = 90

• 77 + (5x + 18) = 360

Angle F and angle H are supplementary angles.

-The measure of angle F is 77°.

-The measure of angle H is (5x + 18)°

Which equation can be used to find the value of x?

• 77 = 5x + 18

• 77 + (5x + 18) = 180

• 77 + (5x + 18) = 90

• 77 + (5x + 18) = 360

What is the value of x?

• 20

• 25

• 30

• 45

What are complementary angles?

• Angles that add up to 180°

• Angles that add up to 90°

• Angles that are equal to each other

• Angles that are opposite of each other when lines intersect.

Tags

CCSS.7.G.B.5

The angle measures of a triangle are shown in the diagram. What is the value of x?

• 25

• 20

• 10

• 28

An isosceles triangle has base angles that each measure 42°. Which equation can be used to find z, the measure of the third angle of this isosceles triangle in degrees?

• 84 + 2z = 180

• 84 + z = 180

• 42 + 2z = 180

• 42 + z = 180

In a triangle, the sum of the angles is always ____.

• 90°

• 180°

• 270°

• 360°

The sum of the measures of angle M and angle R is 90°

-The measure of angle M is (5x + 10)°

-The measure of angle R is 55°

What is the value of x?

Mathematical Equivalence

ON