Triangle Review – Practice Problems

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A triangle is polygon with three edges and three vertices. It has three angles, which always add up to 180º. A triangle can be equilateral, isosceles, or scalene when classified according to its side lengths and can be acute, right, or obtuse when classified according to its angles.

An equilateral triangle has three equal sides, an isosceles triangle has two equal sides, and a scalene triangle has no equal sides.

An acute triangle has three acute angles, a right triangle has one right angle and two acute angles, and an obtuse triangle has one obtuse angle and 2 acute angles.

An equilateral triangle is equiangular, meaning that each angle is the same; the angles of an equilateral triangle are all 60º.

An isosceles right triangle has two equal sides and one right angle. Thus, the three angles in an isosceles right triangle are 45º, 45º, and 90º.

Classify two-dimensional figures into categories based on their properties.

CCSS.MATH.CONTENT.5.G.B.3

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Exercises in this Practice Problem
Classify the different triangles.
Decide if the suspect is the thief.
State what kind of triangle appears in each flag.
Identify the bank robber's safe house.
Identify the true statements about triangles.
Determine which portions of the statements are incorrect.