Suppose frost wedging splits a spherical rock into two equal sized pieces. The original diameter of the rock was 2 meters. Calculate the total surface area of the original rock and of the two hemispheres created after wedging
occurred. Use the formulas are area of a circle (A = Ter?) and surface area of a sphere (A = 41182)
Refer to the diagram to the right to visualize the increase
in surface area after the rock is broken.

-14

step-by-step explanation:

2x2 – 2(x+4)

=2x2-2（5+4）

=4-2×9

=4-18

=-14

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.

6mm^3 or .6cm^3

      216

      /   \

  36     6

  /   \     /

6     6   6

factor trees are nice.

d. 145*2 is 290 than the total angle is 360 then minus 290 then divide by two