# In isosceles triangles, the angle at the base is 70 degrees to which the other angles are equal.

July 25, 2021 | education

| The angles at the base of an isosceles triangle are equal to each other, since equal lateral sides are adjacent to them. I.e

∟1 = ∟2 = 70o – angles at the base of an isosceles triangle.

Since the total sum of all the angles of the triangle is 180 °, then to find one of the angles, we subtract the sum of equal angles from this sum:

180o – (70o + 70o) = 180o – 140o.

Answer: 40o.

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