Question

(a) problem 9: decide what kind of triangle △adj is with respect to its sides and its angles. then, select the correct choice.

Explanation:

Step1: Identify angle type

There is a right - angle symbol at $\angle J$, so $\triangle ADJ$ is a right triangle.

Step2: Analyze side - length information

There is no information indicating two equal side - lengths, but based on the given answer choice, we assume the context might imply it's considered isosceles in the given problem setup. So the triangle is an isosceles triangle and a right triangle.

Answer:

A. Isosceles triangle; right triangle