C1/C2 = 2/3
2pi r1 / 2pi r2 = r1/r2 = 2/3
r1/39 = 2/3
r1 = 39*2/3 = 26
So, your answer is 26cm
Answer:
10. 7
11. 4
12. 8
13. 7
14. 2
15. 3
16. 11
17. 9
18. 8
Step-by-step explanation:
Answer:
Step-by-step explanation:
x= -5 or x=2
that's what i think it is.
Answer:
Step-by-step explanation:
x =135(being opposite angles of a parallelogram)
Take it apart mentally cylinder+2hemispheres 2hemispheres=2half spheres=1 sphere 15=radius of sphere+legnth of cylinder+radius of spehre diameter=5 d/2=5/2=r 15=2.5+legnth+2.5 10=legnth of cylinder surface area of sphere=4pir^2 surface area of cylinder (not including bases) is pidh sphere radius=2.5 SA=4pi2.5^2 SA=4pi6.25 SA=25pi SA=78.5 sphere area SA=5pi10 SA=50pi SA=157 add them 78.5+157=235.5 mm^2
