Heron's Formula
 1) The sides of a triangle are 10 cm, 12 cm and 14 cm respectively, then its area is ____cm2. 88  24√ 6 82  80

 2) If the sides of a triangle are 13 cm,14 cm and 15 cm respectively, then the area of the triangle is 84 cm2 True False

 3) The perimeter of a triangular field is 450 m and its sides are in the ratio 13 : 12 : 5. Then the area of the triangle is ____ m2 4250 m2 6750 m2 5750 m2 3670 m2

 4) If the sides of a triangle are 18 cm and 10 cm and its perimeter is 42 cm , then the area of the triangle is ____ 25√11cm2 22√11cm2 23√11 cm2 21√11 cm2

 5) An isosceles triangle has perimeter 20 cm and each of the equal sides is 6 cm, then its area is ____. 9√15cm2 20√14 cm2 15√2√ cm2 8√5√ cm2

 6) The lengths of the sides of a triangle are 5cm,12cmand13cm . The length of perpendicular from the opposite vertex to the side whose length is 13cm is ____. 12/13cm 60/13cm 45/30cm 45/25cm

 7) If the sides of a triangle are 14 cm,15 cm and 11 cm , then the area of the triangle is ____. 30√6 cm2 28√6 cm2 40√6cm2 35√6cm2

 8) If two sides of a triangle are 5 cm, 12 cm and the perimeter is 30 cm , then the area of the triangle is ____. 30 cm2 20 cm2 50 cm2 40 cm2

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