Find the area of an isosceles triangle if the sides are 7 cm, and the angle (not at the base) = 30 (gr.)
September 28, 2021
1) The area of the triangle is equal to half of the product of the sides by the sine of the angle between them, thus, since it is given from our condition that both sides are equal in 7 cm, then
2) S = 1/2 * 7 * 7 * sin 30 = 1/2 * 7 * 7 * 0.5 = 1/2 * 49 * 0.5 = 12.25 cm ^ 2.
Answer: S = 12.25 cm ^ 2.
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