kwizNET Subscribers, please login to turn off the Ads!
 Email us to get an instant 20% discount on highly effective K-12 Math & English kwizNET Programs!

#### Online Quiz (WorksheetABCD)

Questions Per Quiz = 2 4 6 8 10

### Grade 7 - Mathematics9.4 Area of a Circle - II

 Example: The circumference of a circle is 30.8 cm. Find its area. Solution: If r is the radius of a circle, we have Circumference (C) = 2pr Therefore, the area of the circle = p r2 A = p(C/2p)2 A = C2 / 4p Given that, C = 30.8 cm. A = (30.8)2/4 * 7/22 A = 6640.48 / 88 A = 75.46 sq cm. Therefore, the area of he circle (A) = 75.46 sq cm. Directions: Read the above example carefully and answer the following questions. Also write at least 10 examples of your own.
 Q 1: The circumference of a circle is 52.8 cm. Find its area.221.76 sq cm22.176 sq cm2217.6s q cmNone of these Q 2: The circumference of a circle is 33 cm. Find its area.866.25 sq cmNone of these86.625 sq cm8.6625 sq cm Q 3: The circumference of a circle is (550/5) cm. Find its area.9.625 sq cm962.5 sq cmNone of these96.25 sq cm Q 4: The circumference of a circle is 44 cm. Find x if its area is given by 77x sq cm.None of these2 cm8 cm4 cm Q 5: The circumference of a circle is 22x cm. Find x if its area is given by 38.5 sq cm.2 cm1 cm3 cmNone of these Q 6: The circumference of a circle is 22p cm. Find its area.380.13 sq cmNone of these3.801 sq. cm38.01. sq cm Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!

#### Subscription to kwizNET Learning System offers the following benefits:

• Unrestricted access to grade appropriate lessons, quizzes, & printable worksheets
• Instant scoring of online quizzes
• Progress tracking and award certificates to keep your student motivated
• Unlimited practice with auto-generated 'WIZ MATH' quizzes
• Child-friendly website with no advertisements
• Choice of Math, English, Science, & Social Studies Curriculums
• Excellent value for K-12 and ACT, SAT, & TOEFL Test Preparation
• Get discount offers by sending an email to discounts@kwiznet.com

 Quiz Timer