MATH TASK FOR VIII GRADE

1.The circumference and are a circle witch the radius 12 cm is…
a. 452.16 cm and 75.36 cm² c. 75. 36 cm and 452. 16 cm2
b. 37. 68 cm and 113. 04 cm2 d. 113. 04 cm and 37. 68 cm2
2. The area of a circle is 1386 cm2, the radius its circle is ….. ( take phi =22/7 )
a. 5, 26 cm c. 21, 00 cm
b. 10, 50 cm d. 42, 00 cm
3. The circumference of a circle is 12, 56 cm,the area its circle is …(take phi=
3.14)
a. 12, 56 cm2 c. 50, 24 cm2
b. 25, 12 cm2 d. 75, 36 cm2
4. Run wheel has 500 times to a distance 660 m, then the radius of wheel is …
a. 14 cm c. 28 cm
b. 21 cm d. 35 cm
5. Two circles each of radius 17 cm and 25 cm, length of external common tangent
line is 15 cm. The distance between centers of two circles is …
a. 12 cm c. 23cm
b. 17 cm d. 35 cm
6. Given two circles of centers A and B, each of radius 34 c and 10 cm
respectively. The line CD is external common tangent line. If the line CD = 32cm,
the length of AB is …
a. 66 cm c. 42 cm
b. 44 cm d. 40 cm
7. The circles A and B each has radius of 5 cm and 3 cm. The distance between the
point A and the point B is 17 cm. The length of the internal common tangent line
is …
a. 15 cm c. 19 cm
b. 17 cm d. 20 cm
8. Given that radii of two circles are 14 cm and 10 cm. If distance between centers
of two circles is 26 cm, then the length of internal common tangent line of the
two circles is ..
a. 8 cm c. 12 cm
b. 10 cm d. 16 cm
9. Wheel’s diameter of a motorcycle is 56 cm. If the motorcycle travels the distance
of 8.8 km how many times does each wheel rotate?
a. 50 times c. 5500 times
b. 500 times d. 5000 times
10. From problem number 23, if each wheel rotates for 1500 times, what is the
distance traveled?
a. 25 km c. 27 km
b. 26,4 km d. 30 km