CIRCLES AND AREA

FORMULAS

100

WHAT IS THE FORMULA FOR RADIUS OF A CIRCLE?

r=d/2

200

WHAT IS A FORMULA FOR DIAMETER OF A CIRCLE?

d=2r

300

WHAT IS THE FORMULA FOR AREA OF A PARALLELOGRAM?

area= base x height

400

WHAT IS THE FORMULA FOR AREA OF A TRIANGLE?

area = base x height, divided by 2

DEFINITIONS

100

WHAT DO WE CALL THE DISTANCE FROM THE CENTRE OF A CIRCLE TO ANY POINT ON THE CIRCLE?

RADIUS

200

WHAT DO WE CALL THE DISTANCE AROUND A CIRCLE?

CIRCUMFERENCE

300

WHAT DO WE CALL THE DISTANCE ACROSS A CIRCLE, MEASURED THROUGH ITS CENTRE?

DIAMETER

400

WHAT DO WE CALL A QUADRILATERAL WITH BOTH SIDES OF OPPOSITE SIDES PARALLEL?

PARALLELOGRAM

CIRCLES

100

WHAT IS THE SUM OF THE CENTRAL ANGLES OF ANY CIRCLE?

360 DEGREES

200

WHAT IS THE DIAMETER OF A CIRCLE WITH RADIUS 2.7CM?

5.4CM

300

WHAT IS THE CIRCUMFERENCE OF A CIRCLE WITH DIAMETER 9 MM?

28.26 MM

400

WHAT IS THE CIRCUMFERENCE OF A CIRCLE WITH A RADIUS OF 8 CM?

50.24 CM

AREA

100

WHAT IS THE AREA OF A PARALLELOGRAM WITH BASE 7CM, AND HEIGHT 5.5 CM?

38.5 CM SQUARED

200

WHAT IS THE AREA OF A TRIANGLE WITH BASE 6 MM AND HEIGHT 10 MM?

30 MM SQUARED

300

WHAT IS THE AREA OF A CIRCLE WITH RADIUS 3 CM?

28.26 CM SQUARED

400

THE AREA OF A RECTANGLE IS 24 CM. IF THE BASE IS 4 CM, WHAT IS THE HEIGHT?

6 CM

CIRCLE GRAPHS

100

45 PEOPLE WERE ASKED THEIR FAVORITE DRINK. 17 CHOSE PEPSI, 19 CHOSE COKE, AND THE REST CHOSE OTHER. HOW MANY PEOPLE CHOSE OTHER?

9

200

THERE ARE 355 STUDENTS IN A SCHOOL. 32% OF THEM SAY THAT MATH IS THEIR FAVORITE SUBJECT. HOW MANY STUDENTS PREFER MATH?

114

300

WHEN ASKED THEIR FAVORITE COLOR, 52% OF STUDENTS CHOSE BLUE, 19% CHOSE YELLOW, 7% CHOSE GREEN, AND THE REST CHOSE RED? WHAT PERCENT OF STUDENTS CHOSE RED?

22%

400

80 STUDENTS WERE ASKED THEIR FAVORITE SPORT. 35% OF STUDENTS CHOSE BASKETBALL, 40% CHOSE HOCKEY, AND 25% CHOSE VOLLEYBALL. HOW MANY STUDENTS CHOSE HOCKEY?

32