**Answer:**

brainlest = answer

**Step-by-step explanation:**

**Answer:**

66.4°

**Step-by-step explanation:**

cos XYZ = XY/ZY = 6/15 = 2/5 = 0.4

Using a calculator for cos^(-1) of 0.4 you get 66.42182152°

**Answer:**

It is 7 whole

**Step-by-step explanation:**

3/15 is 5 without anything left plus the 3 is 7

It would be 37.5%.

You move the two decimal places to the right and add a percent sign.

**Answer:**

**The length of the base the pyramid is 116 feet.**

**Step-by-step explanation:**

**See the diagram attached to this answer.**

Let Δ OAB is the side triangle of the square pyramid, and A'B' is the mid segment parallel to the ground with length of 58 feet.

**Now, Δ OAB and Δ OA'B' are similar triangle and the length of sides of the triangle Δ OA'B' are in the same ratio with the corresponding sides of Δ OAB.**

Hence,

⇒ **AB = 2 × 58 = 116 feet. **

**The length of the base the pyramid is 116 feet. **(Answer)