Hello from MrBillDoesMath!
Answer:
72
Discussion:
Total Surface area = area of pyramid base + 4 ( area of triangular face)
In our case this becomes
4*4 + 4( (1/2) (4)(7) ) =
= 16 + (2)(4)(7)
= 16 + 56
= 72
which is the first choice.
Note: the area of a triangular face was computed using (1/2) b h, which in our case is
(1/2) (4) (7)
Thank you,
MrB
<span>The steps for using a compass and straightedge to construct an equilateral triangle are as follows:
1. </span><span>Construct a circle with point E as the center and a circle with point F as the center with each circle having radius EF
2. </span><span>Construct line EF
3. </span><span>Construct a point at one of the two intersection points of circle E and circle F and label this point G
4. </span><span>Construct line EG and line FG.</span>
It should be A or 180 square inches. You can do this problem by splitting the shapes into 3 different squares. Two of the squares, which are the smaller ones have the dimensions of 3x10 and then the big square has the dimensions of 8x15. The once you find the areas of the squares you add them together which should equal 180 square inches.
1) 8/3
2) 21/5
3)1/16
4)9/8
5)9.07
6)5.26
7)0.2822
8)0.024
9)41.2
10)8400
Round 591.3 to 600 and 29 to 30
Now divide 600 and 30 to get 20
The answer is C. 20
pretty easy, right?
Give 5 stars if this helped please!<span>
</span>
