Question

which figure is an isosceles triangle?

Explanation:

An isosceles triangle has at least two sides of equal length. Figure 5 appears to have two equal - length sides (assuming it is an equilateral triangle, which is a special case of an isosceles triangle with all three sides equal). Figure 6 is a right - triangle with no indication of two equal sides. Figure 7 has two equal - length sides.

Answer:

Figure 5 and Figure 7.