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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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