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levacccp [35]
3 years ago
5

In the figure below, B is between A and C and C is between B and D. if BC=4, BD=12, and AD=15 and AC

Mathematics
2 answers:
Sladkaya [172]3 years ago
7 0
I believe the answer is 7.
Sindrei [870]3 years ago
4 0

Answer:

AC = 7

Step-by-step explanation:

1. Draw out the line and label everything you know.

2. By observation, we know that AD is also equal to AC + CD.

3. To find CD, take the length of BD (12) and subtract it by the length of BC (4): 12 - 4 = 8. The length of CD is 8.

4. Finally, to find AC, subtract the length of CD (8) from AD (15): 15 - 8 = 7. The length of AC is 7.

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Reika [66]

So we want to find the surface area of this pyramid. Finding the surface area of a 3D shape is essentially finding the area of all its sides and adding them together.

What we're going to have to do here is find the area of the base of the pyramid, which is basically a square, and find the area of all four sides of the pyramid, which are triangles.

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First we will find the area of the base:

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