Answer:
308.13/15=20.553 or 21
Step-by-step explanation:
hope this helps
plz mark brailiest
In geometry<span>, a </span>disk<span> is the region in a </span>plane<span> bounded by a </span>circle<span>. A disk is said to be </span>closed<span> if it contains the circle that constitutes its boundary, and </span>open<span> if it does not.</span>
Answer:
Step-by-step explanation:
Let r be the radius of the semicircle, then 2r is the width of the rectangle. Let y be the length of the rectangle. The perimeter of the window consists of two lengths, one width and length of semicircle, then
Express y:
The area of the window is
Substitute y into the area expression:
Find the derivative A':
Equate A' to 0:
When then and the function A is increasing, when then and the function A is decreasing. This means that at point the function A takes it maximal value (the area is maximal).