Question

From a circular card sheet of diametre 28 cm, two circles of radii 3.5 cm and a rectangle of 3 cm by 2 cm are removed. Find the area of the remaining sheet.

Answer 1

Answer:

Step-by-step explanation:

Area of remaining sheet = Area of circular card sheet -2× area of one circle -area of rectangle

= 22/7 ×28×28- 2×22/7×7×7-3×2

=88×28 -44×7-6

=2464-308-6

=2464-314=2150cm^2

Answer 2

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Area of outer circle =$\pi {r}^{2} \\ = \frac{22}{7} \times 14 \times 14 \\ = 22 \times 28 = 616 cm²</p><p>⠀⠀⠀⠀</p><p>\\ \\ area \: of \: inner \: circle \: = 2 \times \pi {r}^{2} \\ \: = \: 2 \times \frac{22}{7} \times 35 \times 35 \\ = 22 \times 3.5 \\ = 77 {cm}^{2} \\ \\ </p><p>area \: of \: rectangle = \: l \times b \\ area</p><p> \: of \: whole \: circle \: -</p><p> \: ( \: area </p><p>\: of \: the</p><p> \: both \: circles \: </p><p>+ </p><p>\: area \: of</p><p> \: rectangle</p><p> \: ) \: = \: area </p><p>\: of</p><p> \: remaing \: sheet. \\ = 616 \: - \: ( \: 77 + 3) \\</p><p> = 616 - 80 = </p><p> {536cm}^{2} ....$