Triangles Unit Test Review

Front

What is the centroid of a triangle?

Back

The centroid is the point where the three medians of a triangle intersect. It is also the center of mass of the triangle.

Front

What is a perpendicular bisector?

Back

A perpendicular bisector is a line that divides a segment into two equal parts at a 90-degree angle.

Front

If m∠CAP = 34°, what is m∠CAB if the triangle is isosceles?

Back

m∠CAB = 68°.

Front

How do you find the missing angle in a triangle?

Back

To find the missing angle, use the fact that the sum of the angles in a triangle is 180°. Subtract the sum of the known angles from 180°.

Front

Can the sides 8, 10, and 20 form a triangle?

Back

No, because the sum of the lengths of the two shorter sides (8 + 10 = 18) is less than the length of the longest side (20).

Front

What is the incenter of a triangle?

Back

The incenter is the point where the angle bisectors of a triangle intersect. It is also the center of the circle inscribed within the triangle.

Front

What is the orthocenter of a triangle?

Back

The orthocenter is the point where the three altitudes of a triangle intersect.

Front

What is the relationship between the angles in a triangle?

Back

The sum of the interior angles of a triangle is always 180°.

Front

What is an altitude in a triangle?

Back

An altitude is a perpendicular segment from a vertex to the line containing the opposite side.

Front

What is the difference between a median and a midsegment?

Back

A median connects a vertex to the midpoint of the opposite side, while a midsegment connects the midpoints of two sides of a triangle.