calculate the area and perimeter of the following ring where a=7cm and b=14cm
please tell me
Answers
Step-by-step explanation:
Area of both Rings:
• Area of circle = πr²
Area of ring = πr² = 22/7 × 7 × 7 cm²
Area of ring = πr² = 22/7 × 7 × 7 cm² = 154 cm²
• Area of circle = πr²
Area of ring = πr² = 22/7 × 14 × 14 cm²
Area of ring = πr² = 22/7 × 14× 14 cm² = 616 cm²
Perimeter of Rings:
• Circumference of circle = 2πr
Perimeter of ring = 2πr = 2 × 22/7 × 7
Perimeter of ring = 2πr = 2 × 22/7 × 7 = 44 cm
• Circumference of circle = 2πr
Perimeter of ring = 2πr = 2 × 22/7 × 14
Perimeter of ring = 2πr = 2 × 22/7 × 14 = 88 cm
. Area of shaded part of both rings:
As you know they are concentric circles
AREA OF CIRCLE= pi×r²
PERIMETER OF A CIRCLE= 2×pi×r
so we will solve the circle which is closer to the centre(a=7)
Area- pi×r²
=22/7×7²
=22/7×7×7
=22×7(because the 7 cuts the 7)
=154cm²
PERIMETRE- 2× pi× r
=2×22/7× 7
=2×22(because the 7 cuts the 7)
=44cm
now we will solve the second circle with radii 14cm
Area= pi× r²
= 22/7× 14×14
=22×2×14(because 7 cuts 14 into 2(14/7=2))
=616cm²
Perimetre=2×pi×r
=2×22/7×14
=2×22×2(14/7=2)
=88cm
Now we have to find the area of the shaded ring so its so easy now just subtract both circles area
=616-154=462
so this means that the shaded ring's area is 462cm².......
Answer:
hey dear friend!!
Step-by-step explanation: