An equilateral triangle with side length 7 cm is shown in the diagram, work out the area of the triangle.
1 answer:
If a triangle has sides of 7 cm and it is an equilateral you can draw a line right down the middle to form two congruent triangles. These smaller triangles have a hypotenuse of 7cm and a base of 3.5 cm (7/2) To work out the height, use Pythagoras’ theorem. a^2 + b^2 = c^2 where c is the hypotenuse and a and b are the other two sides 7^2 - 3.5^2 = 36.75 Square root answer = 6.06 cm That’s the height of the triangle Area of a triangle is base x height divided by 2 So 7 x 6.06 = 42.43… /2 = 21.2 cm^2 to one d.p Hope this helped! Please mark Brainliest!!
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