Current location - Training Enrollment Network - Mathematics courses - The answer to the extracurricular questions in the first volume of sixth grade mathematics of People's Education Press is urgent! ! ! ! ! ! ! ! ! ! ! ! ! Thank you all. Hurry up!
The answer to the extracurricular questions in the first volume of sixth grade mathematics of People's Education Press is urgent! ! ! ! ! ! ! ! ! ! ! ! ! Thank you all. Hurry up!
1。 R = 33.12/(2 * 3.14+2) = 4 (cm)

Circumference: 2*4*3. 14=25. 12 (cm)

Area: 3. 14*4*4=50.24 (square centimeter)

2。 Circumference: 3. 14*4*2=25. 12 (cm)

Area: 3. 14*4*4=50.24 (square centimeter)

3。 Radius: 15. 42/(3。 14+2)=3 (cm)

Area: 3. 14*3*3/2= 13.63 (square centimeter)