In the right-angled triangle shown, a line is drawn from the right-angle corner to the slanting side, meeting it at right angles. From the foot of that line a second line is drawn straight across to the upright side. How many triangles are there?

Question

Accepted Answer

5. The two lines cut the triangle into 3 small triangles. The top two small ones together form a triangle, and the whole figure is one more: 3 + 1 + 1 = 5 .

In the right-angled triangle shown, a line is drawn from the right-angle corner to the slanting side, meeting it at right angles. From the foot of that line a second line is drawn straight across to the upright side. How many triangles are there?

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