Question

20 2 cm, 5 cm hermine the perimeter of the triangle whose sides are of the given measures. (b) 18 cm, 23 cm, 46 cm 12, 24 cm, 17 cm (d) 11 cm, 21 cm, 24 cm e perimeter of a rectangle is 46 cm. The breadth of the rectangle is 12 cm. Find its net 3 m, 4 cm (b) 13 cm 4X13 Determine the perimeter of the rectangle whose length and breadth are of the given Best (b) 9 cm, 12 cm (c) 19 m, 17 m (d) 12 cm, 15 cm determine the perimeter of the square whose sides are of the given measures. 4 ore ( (c) 12 m 4x12. (d) 90 cm 4 X90 5200 - 4 Tad the length of the side of a square whose perimeter is: 360 (b) 28 cm (c) 120 m (d) 256 cm saj goes for a morning jog to reduce weight. He goes to a rectangular es whose length is 80 m and width is 33 m. If he jogs five rounds of park daily, how much distance is covered by him, in kilometres? a) 6 cm​

Answer 1

Answer:

Find the area of a triangle two sides of which are 18 cm and 10 cm and the perimeter is 42 cm.

Medium

Solution

verified

Verified by Toppr

Two sides length are given, we need to figure out the length of this side.

⇒Let x be length of third side

⇒Perimeter =42 cm

⇒18+10+x=42

⇒x=42−28=14 cm

⇒2s=42

⇒s=21 cm

⇒a=18,b=10,c=14

⇒A=

s(s−a)(s−b)(s−c)

⇒

21(21−18)(21−10)(21−14)

=

21×3×11×7

⇒A=21

11

cm

2