Lesson 26 Practice

Match the following triangles with their descriptions.

• A triangle with ONE angle equal to 90 degrees

• A right triangle

• A triangle with THREE congruent sides and angles

• An isosceles triangle

• A triangle with THREE angles smaller than 90 degrees.

• An acute triangle

• A triangle with TWO congruent sides

• An equilateral triangle

Answer explanation

Which of the following angles would create a RIGHT triangle?

Select all that apply.

Answer explanation

Remember all three angles in a triangle must add to 180 degrees total!

What MUST be true about the angles of any triangle?

• One angle must be 90 degrees

• All the angles sum to 180 degrees

• All the angles sum to 360 degrees

• All angles must be 90 degrees or larger

Where do you find the HYPOTENUSE of a right triangle?

• Opposite the 90 degree angle

• The LONGEST side

• The SHORTEST side

• Opposite the SMALLEST angle

• Opposite the LARGEST angle

Pythagorean Theorem tells us that the ​ (a)   ​+ the BLUE AREA

= ​ the (b)  

• RED AREA
• PURPLE AREA
• BLUE AREA

• leg
• hypotenuse
• square

• No mistake.

What is the measure of the missing angle?

Is the triangle a RIGHT triangle?

• Yes, this is a right triangle.

• No, this is not a right triangle.

• Not enough information to tell.

What do the tick marks on the triangle tell us?

• The two sides are congruent

• The two sides are similar

• All the angles are 80 degrees

• Nothing, they are a printing mistake