Answer:
last answer is correct...
Equilateral triangle is a triangle in which all its sides are equal.
Given:
side = 10 cm
Area of an equilateral triangle = √3/4 a²
1st: a = 10 ; A = 43.3 cm²
2nd: a = 5 ; A = 10.83 cm²
3rd: a = 2.5 ; A = 2.71 cm²
4th: a = 1.25 ; A = 0.68 cm²
5th: a = 0.625 ; A = 0.17 cm²
6th: a = 0.3125; A = 0.042 cm²
7th: a = 0.15625; A = 0.011.cm²
Summation: a1/1 -r ; a1 = 43.30 ; r = 0.25
43.30 / 1 - 0.25 = 43.30/0.75 = 57.73 cm²
The sum of the areas of the triangles if the process is continued without end is 57.73 cm²
The volume of the prism is 1782
To find volume use base times height
To find base, use the triangle's area
The area of the triangle is 1/2(8×19) = 162
162 is the base amd the height is 11 so do 11 times 162
You should get 1782 as your answer
Answer:rectangular pyramid
Explanation:1- rectangular pyramid:A rectangular pyramid has only one base that has a rectangle shape. Slanting sides meet at a vertex in the top.
2- Heptagonal prism:A prism whose two bases are heptagons (7-sided polygons). The two bases are parallel and congruent
3- Cylinder:A prism whose two bases are circles. The two bases are parallel and congruent
4- Cube:A prism whose two bases are squares. The two bases are parallel and congruent
I have attached figures of the all 4 options for better illustration.