Classifying Triangles by Sides and Angles

Triangles by sides

100

What is a triangle that has all sides that are the same? 

What is an equilateral triangle? 

200

If a triangle has the side lengths of 4cm,3cm, and 4 cm, what kind of triangle is it? 

What is an isosceles triangle? 

300

If a triangle has sides that are 3cm, 6cm, and 4 cm, it is  _____________. 

What is scalene? 

400

Triangle ABC has sides that are 5cm,5cm,and 5cm long. 

What is equilateral. 

500

Triangle ABC has sides that are 11cm,11cm, and 12cm. Triangle DEF has sides that are 13cm,12cm,14cm. What kind of triangle is ABC? 

What is isosceles? 

Triangles by angles

100

What angle is always less than 90^o ?

acute

200

A triangle that has an angle of 110^o. 

obtuse triangle

300

If a triangle has the angles 60^o, 60^o, and 60^o, what kind of triangle is it? 

Acute equilateral triangle

400

A triangle has the angles 45^o, 45^o, and 90^o. What kind of triangle will this not be. 

Obtuse or Acute

500

If a triangle is a right triangle this means that.... 

One angle is 90 degrees

Triangles by sides & angles

100

What is a triangle that has angles that are all less than 90 degrees and 2 sides that are the same?  

 An acute isosceles triangle.

200

I have a triangle that has sides that are 5cm, 3cm, and 5cm. The angles are 65^o, 45^o, and 70^o. What is the triangle? 

 acute isosceles triangle

300

This triangle has angles that are 90^o, 65^o, and 25o. The sides are 3cm, 4cm, and 5cm. 

 right scalene triangle

400

Triangle DEF has 2 sides that are 5cm and one side that is 3cm. It has two angles that measure 40^o and one that measures 100^o. This is an _________ ________. 

obtuse isosceles triangle 

500

Sides - 3cm,6cm, 7cm 

Angles- 47^o, 33^o,100^o

obtuse scalene triangle