1.

If in an isosceles triangle, each of the base angles is 40°, then the triangle is(a) Right-angled triangle(b) Acute angled triangle(c) Obtuse angled triangle(d) Isosceles right-angled triangle

Answer»

(c) Obtuse angled triangle

We know that, sum of interior angles of triangle is equal to 180o.

Let us assume the 3rd angle be Q,

Then, 40o + 40o + Q = 180o

80o + Q = 180o

Q = 180 – 80

Q = 100o

An obtuse triangle (or obtuse-angled triangle) is a triangle with one obtuse angle (greater than 90°) and two acute angles. Since a triangle’s angles must sum to 180o.



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