A square of side 72 cm and a rectangle of length 90 cm have same perimeter. Find the difference in areas ? A)216cm2 B)304

Question

A square of side 72 cm and a rectangle of length 90 cm have same perimeter. Find the difference in areas ?

A)216cm2
B)304cm2
C)324cm2
D)328cm2

in progress 0
Phúc Điền 3 months 2021-07-25T17:54:10+00:00 2 Answers 7 views 0

Answers ( )

    0
    2021-07-25T17:55:59+00:00

    Answer:

    C) 324cm²

    Step-by-step explanation:

    1) they have the same perimeter so to find it you add all four sides of the square because they are all the same ( 72+72+72+72=288)

    2) now you multiply 90 by 2 because the rectanglehas to sides of the same length(90×2=180) the answer you get you are going to subtract to 288 (288-180=108)

    3) now divide 108 by 2 (108÷2= 54) the answer you get equals the width of the side of the rectangle

    4) to get the area of the rectangle you multiply 54 with 90 (54×90=4,860) to get the area of the square you multiply 72 times 72 (72×72=5,184)

    5) now you subtract 5,184 and 4,860 ( 5,184-4,860= 324cm²)

    0
    2021-07-25T17:56:07+00:00

    Answer:

    324 cm²

    Step-by-step explanation:

    → Work out perimeter of square

    72 + 72 + 72 + 72 = 288

    → Work out the width of the rectangle

    288 – (90 × 2) = 108

    108 ÷ 2 = 54

    → Work out area of square

    72 × 72 = 5184 cm²

    → Work out area of rectangle

    90 × 54 = 4860 cm²

    → Minus the areas from each other

    5184 cm² – 4860 cm² = 324 cm²

Leave an answer

Browse

Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )