Question

which of these shapes is an obtuse isosceles triangle?

Explanation:

Step1: Recall triangle - type definitions

An isosceles triangle has two equal - length sides. An obtuse triangle has one angle greater than 90 degrees.

Step2: Examine each triangle

Visually inspect each of the given triangles to check for two equal - length sides and an obtuse angle.

Answer:

(Without seeing the specific lengths and angles precisely from the image, assume the blue triangle is the one that has two equal sides and an obtuse angle. So the answer is the blue triangle if it meets the criteria.)