Class : Class 5
Answer is D as the question says to find the perimeter, which is (7*2) cm+4 cm+(9*2) cm+15 cm+8 cm+5 cm+(4+5+9) cm=14 cm+4 cm+18 cm+15 cm+8 cm+5 cm+18 cm=82 cm.
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Ans 1:
Class : Class 8
Answer is C. a^2 ÷ 2
Because diagonals of a square are equal. And area of rhombus formula can be used here because both have all sides equal.
Area of rhombus= 1/2(diagonal 1 × diagonal 2)
Because diagonals are equal, we write it as :
a × a÷ 2
=a^2 ÷2
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Ans 1:
Class : Class 8
Since triangle ABD is congruent to triangle ACD by SSS rule, so the altitude will also be the same. Which means BE=EC, as these are the altitudes of the triangles.