An isosceles triangle has an angle that measures 100 degrees. What other angles could be in that isosceles triangle

Answer 1

In order to answer this problem, you will need to know the definition of an isosceles triangle.

An Isosceles triangle is specified as a triangle with 2 of its 3 sides having equal lengths.

Step 1: Draw your triangle.

1. Since 2 of your 3 sides are equal length and the primary angle measures 100°, you are dealing with an obtuse triangle or, properly named, a obtuse isosceles triangle.

Step 2: Label your angles inside of your triangle.

1. Remember that the sum of the angles inside of a triangle must add up to equal 180°.
2. Since we know the triangle we are dealing with in this problem, we can label our unknown angles 'x'.

Caution: The above statement ONLY applies to this type of triangle.

Step 3: Write an equation.

100° + x° + x° = 180°

Step 4: Solve for x.

100° + x° + x° = 180°

100° + 2x° = 180°

2x = 80°

x = 40°

The other angles in the obtuse isosceles triangle both equal 40°.