8GM Geometry Quiz

• 50

• 55

• 75

• 105

Answer explanation

Left triangle's missing angle is
55 + 50 + x = 180

105 + x = 180

x = 75

The 75 angle is vertically opposite to a, so a = 75

Find the missing angle

Answer explanation

These angles are complementary as they add up to 90 degrees.

x + 62 = 90

x = 28

Find the missing angle.

Answer explanation

Supplementary angles as they add up to 180.

50 + 40 + 47 + x = 180

137 + x = 180

x = 43

Find the missing angle.

Answer explanation

This is a revolution i.e., 360 degrees

90 + 130 + x = 360

220 + x = 360

x = 140

The angle sum of a triangle is always equal to:

Answer explanation

The sum of all three angles in a triangle is 180

Two triangles are congruent if they are the:

• Same shape only

• Same size only

• Same shape and size

• None of these

Answer explanation

Congruence means EXACTLY the same shape and size.

No bigger, no smaller.

What's another name for translation?

• Flipping

• Sliding

• Turning

• Enlarging

Answer explanation

Translating means moving it left/right and/or up/down

• Translation

• Rotation

• Reflection

• None of these

Answer explanation

ABC has been flipped over the horizontal line.

The symbol for congruence is:

• |||

• =

• None of these

• SSS

• SAS

• AAS

• RHS

Answer explanation

Two of the same angles and one same side length.

It's AAS and not ASA as only one of the angles touches the side length.