Question

3. The angles of a triangle are in the ratio 3:5:7. The triangle is
(a) acute angled
(b) obtuse angled
(c) right angled
(d) an isosceles triangle
1​

Answer 1

Answer:

3:5:7

Let the common multiple be x

3x+5x+7x=180

15x=180

×=12

3x=3×12=36°

5x=5×12=60°

7x=7×12=84°

Thus it's a acute angled triangle.

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