Question

A triangle has angles measuring 10 degrees, 40 degrees and 130 degrees with side lengths of 23 cm, 84 cm and 100 cm. Classify this triangle by its angles and sides.
A) acute equillateral
B) obtuse isosceles
C) acute isosceles
D) obtuse scalene

Answer 1

Answer:

The correct answer is D. obtuse scalene

Step-by-step explanation:

1. Let's recall that a equilateral triangle has its three sides of the same length. An equilateral triangle is always equiangular. This is not our given triangle.

2. Let's recall that an isosceles triangle has two sides of the same length. This is not our given triangle.

3. Finally, let's recall that in a scalene triangle, none of the sides are the same length. And if one of the given angles is greater than a right angle, measures more than 90 degrees, it is an obtuse triangle. This is our given triangle.

The correct answer is D. obtuse scalene.