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17. Perimeter and Area of Plane Figures
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Q9 of 97 Page 772

Each side of an equilateral triangle is 10 cm. Find (i) the area of the triangle and (ii) the height of the triangle.

Given: Side of an equilateral triangle = 10 cm



(i) Area of equilateral triangle =








(ii) Height of equilateral triangle =







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7

The difference between the sides at right angles in a right-angled triangle is 7 cm. The area of the triangle is 60 cm2. Finds its perimeter.

8

The lengths of the two sides of a right triangle containing the right angle differ by 2 cm. If the area of the triangles 24 cm2, find the perimeter of the triangle.

10

The height of an equilateral triangle is 6 cm. Find its area. [Take √3 = 1.73.].

11

If the area of an equilateral triangle is 36√3 cm2, find its perimeter.

Questions · 97
17. Perimeter and Area of Plane Figures
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