Page 1 :
Clsss 9th, Heron's formula, , Assertion-Reasoning MCOs, , Directions (Q.Nos. 19-28) Each of these —, questions contains two statements : Assertion, (A) and Reason (R). Each of these questions, also has four alternative choices, any one of, which is the correct answer. You have to, select one of the codes (a), (b); (c) and (d), 8iven below., , 19., , 20., , 21., , 22., , 23., , 24., , (a) Ais true, Ris true; Ris a correct, explanation for A., , (b) Ais true, R is true; Ris not a correct, explanation for A., , (c) Ais true; Ris false., , (d) Ais false; Ris true., , Assertion (A) The height of the ,, triangle is 18 cm and its area is 72 cm 3, then, ils base is 8 cm., , Reason (R) Area of a triangle, , =5 x base x height, , Assertion (A) The perimeter of a, , right angled triangle is 60 cm and its, , hypotenuse is 26 cm. The other sides, , of the triangle are 10 cm and 24 cm., , Also, area of the triangle is 120. cm”., , Reason (R) (Base)? + (Perpendicular)?, = (Hypotenuse)’., , Assertion (A) The side of an, equilateral triangle is 6 cm then the, height of the triangle is 9 cm., , Reason (R) The height of an equilateral, triangle is = a., , Assertion (A) The side of an, equilateral triangle is 6 cm then the, area of the triangle is 9 cm?., , Reason (R) All the sides of an, equilateral triangle are equal., Assertion (A) Semi-perimeter of, an equilateral triangle having area, 4/3 cm? is 16 cm., ath+e, , 2, semi-perimeter and a, 6 and ¢ are sides, of triangle., Assertion (A) If the area of an, equilateral triangle is 81V3 cm?, then, the semi-perimeter of triangle is 20 cm., , , , Reason (R) s = where s is

Page 2 :
25,, , 26., , 27., , 28., , Reason (R) Semi-perimeter of a triangle, . a+bhb+c ;, S= 7 where a, b, c are sides of, , triangle., , Assertion (A) The sides of a triangle, are in the ratio of 25:14: 12 and its, perimeter is 510 m. Then the greatest, side is 250 cm., , Reason (R) Perimeter of a triangle, =a+b+c, wherea, b, care sides of a, triangle., , Assertion (A) The sides of a triangle, are 3 cm, 4 cm and 5 cm. Its area is, 6 cm?., , Reason (R) If 2s = {a + b +c}, where, a, b, c are the sides of a triangle, then, , area = ,/(s — a) (s — b) (s — c)., , Assertion (A) The sides of a triangle, are in the ratio of 25: 14: 12 and its, perimeter is 510 cm. Then the area of, the triangle is 4449.08 cm?., , Reason (R) Perimeter of a triangle, =a+b+c, where a, b, care sides, of triangle., , Assertion (A) The percentage increase, in the area of a triangle, if its each side, is quadrupled, is equal to 1500%., Reason (R) Percentage increase in the, , ,, , , , area of triangle = - x 100 where A’, , is increasing area and A is area.

Page 3 :
Assertion-Reasoning MCQs, 19. (@ 20. (b) 21. @ 22.(0 23. @ 2% @ 25. (a) 26 @ 27. &) 28. (a)