Question

The sides of a triangle measure 3 cm, 5 cm, and 7 cm. One of the angles is

Answer 1

A triangle that has three unequal sides and one obtuse angle is referred to as an obtuse scalene triangle.

The triangle is (d) obtuse scalene

Given that:

$Sides = \{3cm, 5cm, 7cm\}$

$\theta = 120^o$

The three sides of the triangle are not equal i.e.

$3cm \ne 5cm \ne 7cm$

This means that the triangle is a scalene triangle

One of the angles is given as: $120^0$

$120^0$ is greater than $90^o$

i.e.

$120^o > 90^o$

This implies that the angle of the triangle is obtuse.

Hence, the given triangle is (d) obtuse scalene

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