Triangle Classification: Identifying a Shape with 70°, 70°, and 40° Angles

Question

What kind of triangle is given in the drawing?

00:00 What triangle is shown in the drawing?

00:03 Let's check the triangle's angles and their relation to a right angle

00:06 Angle A is less than a right angle

00:11 The same applies to angles B and C

00:14 A triangle where all angles are less than 90 degrees is acute

00:18 And this is the solution to the question

As all the angles of a triangle are less than 90° and the sum of the angles of a triangle equals 180°:

$70+70+40=180$

The triangle is isosceles.

Isosceles triangle