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perimeter of a closed figure is the distance around it while area isthe measure of the part of plane or region enclosed by it. perimeter of a regular polygon = Number of sides Length of oneside. perimeter of a square = 4 sideFig. perimeter of a rectangle = 2(l + b)Fig. Area of square = side side Area of rectangle = l b Area of parallelogram = b h Area of triangle = 12b h Fig. Fig. The distance around a circle is known as its circumference. The ratio of circumference and diameter of a circle is a constant andis denoted by (pi). Approximate value of is taken as 227 or Circumference of a circle of radius r is 2 r, Area of a circle of radius r is In Examples 1 and 2, there are four options, out of which one is the correct 1:Following rectangle is composed of 8 congruent WordsNumbersFormulaThe circumference C ofa circle is times thediameter d, or 2 times the radius 6=2 3= unitsC= dorC=2 r15-04-2018 Area of each part is(a) 72 cm2(b) 36 cm2(c) 18 cm2(d) 9 cm2 Solution:Correct answer is (d).
UNIT 9 PERIMETER AND AREA (A)Main Concepts and Results • Perimeter of a closed figure is the distance around it while area is the measure of the part of …
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