Question

a triangle whose two angles measure 30 degree and 120 degree is

(a) scalene
(b) isosceles
(c) equilateral
(d) right angled​

Answer 1

Answer:

As two angles are same and the other is different (i.e., all the angles are not the same), hence the triangle is isosceles.

Answer 2

Given - Measure of two angles

Find - Type of triangle

Solution - Correct answer is (b) isosceles

To find the type of triangle, first we will find the missing angle of triangle.

The sum of all the angles of triangle = 180°.

So, angle + 30 + 120 = 180

Angle + 150 = 180

Angle = 180 - 150

Angle = 30°.

As the two angles of triangle are equal, which is 30°, thus the type of triangle is isosceles.

Therefore, correct answer is (b) isosceles