Circle
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AREA AND CIRCUMFRENCE OF A CIRCLE P.K. TESTING 1.What is circle? 2.Give some examples of circle .
CIRCLE
Formula For Area And Circumfrence • Area of a circle = •
3.14r2
• Circumference of a circle=2*3.14r • [3.14 or 22/7] R
• Find Area of Circle if • Radius =10 cm. • Solution:• Area of Circle=3.14r2 • Area of Circle=3.14*10*10 • Area of Circle=314cm.2 10c.m .
r
• Find Radius if area of circle is 616m.2 • Solution:• • • • • • •
Area of circle=22/7r2 616= 22/7r2 616/22/7=r2 616*7/22=r2 196=r r=14m.
r=?
• Find Circumfrence if • Radius =14 cm. • Solution:• • • •
Circumfrence=2*22/7r Circumfrence=2*22/7*14 Circumfrence= 2*22*2 Circumfrence=88cm. r=14
• Find Radius if • Circumfrence=440cm. • Solution:- Circumfernce=2*22/7r • • • •
440=2*22/7r 440/22/7/2=r 440/22*7/2=r r=70cm.
r=?
CIRCLE
Formula For Area And Circumfrence • Area of a circle = •
3.14r2
• Circumference of a circle=2*3.14r • [3.14 or 22/7] R
• Find Area of Circle if • Radius =10 cm. • Solution:• Area of Circle=3.14r2 • Area of Circle=3.14*10*10 • Area of Circle=314cm.2 10c.m .
r
• Find Radius if area of circle is 616m.2 • Solution:• • • • • • •
Area of circle=22/7r2 616= 22/7r2 616/22/7=r2 616*7/22=r2 196=r r=14m.
r=?
• Find Circumfrence if • Radius =14 cm. • Solution:• • • •
Circumfrence=2*22/7r Circumfrence=2*22/7*14 Circumfrence= 2*22*2 Circumfrence=88cm. r=14
• Find Radius if • Circumfrence=440cm. • Solution:- Circumfernce=2*22/7r • • • •
440=2*22/7r 440/22/7/2=r 440/22*7/2=r r=70cm.
r=?
