Triangles

Classify

100

A triangle with two equal sides is called...

Isosceles

200

All sides are the same length and all angles are the same measure. 

Acute Equilateral

300

A triangle where all the sides are different lengths

Scalene

400

A triangle with a right angle and two congruent sides. 

Right Isosceles

500

A triangle with an obtuse angle and no congruent sides. 

Obtuse Scalene

Missing Angle

100

Angle A = 60 degrees

Angle B = 60 degrees

Angle C = ???

60 degrees

200

Angle X = 30 degrees

Angle Y = ???

Angle Z = 90 degrees

60 degrees

300

The other angle in an obtuse triangle if Angle A = 130 degrees and Angle B = 20 degrees. 

30 degrees

400

What is the measure of the other two angles in an isosceles triangle where one angle measures 20 degrees? 

80 degrees

500

The measure of the other two angles in a right isosceles triangle. 

45 degrees

Riddles

100

I am a triangle with three 60 degree angles. What am I? 

Acute Equilateral

200

I have side lengths of 6 inches, 4 inches, and 5 inches. What is my classification of sides? 

Scalene

300

I have an angle measure of 91 degrees. What is my angle classification? 

Obtuse

400

I have a right angle with two sides that are 4.8 inches. What is my name? 

Right Isosceles

500

Nothing about me is the same, and I have one angle that is much larger than the other two. What is my name? 

Obtuse Scalene

Area

100

Base = 4 cm

Height = 6 cm

A = 12 cm² 

200

Height = 2 km

Base = 10 km

A = 10 km²

300

Base = 16 yards

Height = 12 yards

A = 96 yd²

400

Base = 31 feet

Height = 40 feet

A = 620 ft²

500

Height = 81 inches

Base = 90 inches

A = 3645 in²