Intro to Triangles

I Want to be a Triangle!

100

I have side lengths of 12 in. and 13 in.  What are the possible lengths for my 3rd side?

1 in. < x < 25 in.

200

I have side lengths of 6.5m and 8.75m.  What are all the possible lengths for my third side?

2.25m < x < 15.25m

300

Triangle ABC has the following angles:

m<A = 90

m<B = 60

m<C = 30

What is the shortest side length?

Side AB

400

Triangle XYZ has side lengths:

AB = 3u

BC = 5u

AC = 4u

What is the medium sized angle?

<B

500

The sum of the two shortest sides must be _____________ than the third.

greater

Triangle Sides

100

I am a triangle with side lengths of 4in, 3 in, and 7in. What type of triangle am I?

Scalene Triangle

200

I am a triangle with side lengths of 13in, 13 in, and 13in. What type of triangle am I?

Equilateral Triangle

300

I am a triangle with side lengths of 4in, 8in, and 4in. What type of triangle am I?

Isosceles Triangle

400

I am a triangle with side lengths of 21in, 23in, and 23in. What type of triangle am I?

Isosceles Triangle

500

I am a triangle with side lengths of 32in, 43 in, and 18in. What type of triangle am I?

Scalene Triangle

Triangle Angles

100

I am a triangle with angles of 90 degrees, 37 degrees, and 53 degrees. What type of triangle am I?

Right Triangle

200

I am a triangle with angles of 93 degrees, 37 degrees, and 50 degrees. What type of triangle am I?

Obtuse Triangle

300

I am a triangle with angles of 134 degrees, 20 degrees, and 26 degrees. What type of triangle am I?

Obtuse Triangle

400

I am a triangle with angles of 72 degrees, 20 degrees, and 88 degrees. What type of triangle am I?

Acute Triangle

500

I am a triangle with angles of 64 degrees, 26 degrees, and 90 degrees. What type of triangle am I?

Right Triangle

Missing Angles

100

I am formed by supplementary angles. One of my angles is 38 degrees. What is my missing angle?

Missing Angle = 142 degrees

200

I am a triangle with two angles given. One angle is 42 degrees, and the other angle is 48 degrees. Find my missing angle.

Missing Angle = 90 degrees

300

I am a triangle with two interior angles identified.  One remote interior angle is 26 degrees and the other is 53 degrees.  What is the measure of my exterior angle?

Missing Angle = 79 degrees

400

I am a triangle with an exterior angle of 76 degrees.  One remote interior angle is 42 degrees.  What is the measure of my second remote interior angle?

Missing Angle = 34 degrees

500

I am formed by complementary angles. One of my angles is 74 degrees. What is my missing angle?

Missing Angle = 16 degrees

With Algebra!

100

I am a triangle with three angles given. One angle is 70 degrees, one is 65 degrees, and the other angle is (x+53) degrees. Find the value of x.

x = -8

200

I am a triangle with three angles given. One angle is (7x) degrees, one is (15x-1) degrees, and the other angle is 27 degrees. Find the value of x.

x = 7

300

I am a triangle with three angles given. One angle is (x+7) degrees, one is (3x-4) degrees, and the other angle is 65 degrees. Find the value of x.

x = 28

400

I am a triangle with three angles given. One angle is (a) degrees, one is (4a+15) degrees, and the other angle is (3a+5) degrees. Find the value of a.

a = 20

500

I am an isosceles triangle with my two congruent angles given.  They measure (12x+5) and (14x-5).  

What is the measure of my non-adjacent exterior angle?

Exterior Angle = 130 degrees