Answer: 2
Step-by-step explanation:
2.1 is the same as 21/10
which will give 2
Answer:
The last expression 9.
Step-by-step explanation:
hope this helps! let me know if I am wrong
We have the base measurement for the triangles composing the sides. We need their altitude.
Imagine a right triangle with these sides:
(1) from the apex of the pyramid to the point on the base directly underneath it (471 ft);
(2) from the middle of base edge to the point underneath the apex (half of 708 ft = 354 ft);
(3) the hypotenuse, the altitude of a triangular side.
Using the Pythagorean Theorem, we find the hypotenuse to be
√(471^2 + 354^2) = about 589.2 feet
Now we add up the four triangles' areas. Each is base * altitude / 2, so:
4 x 708 x 589.2 / 2
= 2 x 708 x 589.2
= 834,307.2 square feet, the lateral area.
Because the angles in all triangles must add up to 180 degrees the third angle measurement will be 90 degrees. Since the angle is 90 degrees it is automatically a right triangle.