The median of an isosceles triangle, drawn to its base, is 5 cm. The base is 24 cm. Find the side of the triangle.
September 7, 2021 | education
| An isosceles triangle is a triangle in which the sides are equal.
The median of an isosceles triangle, drawn to its base, is also the bisector and height.
Thus, two equal right-angled triangles are based: ΔАВМ and ΔМВС.
Consider a triangle ΔABM. To calculate AB, we use the Pythagorean theorem, according to which the square of the hypotenuse is equal to the sum of the squares of the legs:
AB ^ 2 = BM ^ 2 + AM ^ 2;
AM = AC / 2;
AM = 24/2 = 12 cm;
AB ^ 2 = 5 ^ 2 + 12 ^ 2 = 25 + 144 = 169;
AB = √169 = 13 cm.
Answer: the length of the side of the triangle is 13 cm.
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