Select all that apply. in an isosceles triangle, one angle measures 20°. what are the measures of the other two angles? 80° and 80° 90° and 90° 20° and 140° 20° and 60°

80° and 80°

20° and 140°

Step-by-step explanation:

An isosceles triangle is a kind of triangle that has two equal angles.

Given : In an isosceles triangle, one angle measures 20°.

If it is one of the equal angles , then one other angle must measures 20°.

and Third angle = 180°- 20°- 20°  [ By Angle sum property of triangle]

= 140°

i.e. the measures of other two angles would be 20° and 140°.

If it is not one of the equal angle  then we let the measure of equal angles as x.

By angle sum property of triangle , we have

x+x+20°=180°

⇒ 2x = 160°

⇒ x =80°

i.e. measures of other two angles would be 80° and 80°.

Thus , the correct choices are :

80° and 80°

20° and 140°

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