Answer:
Step-by-step explanation:
DE² = 29² - 21² = (29+21)(29-21) = 50*8 = 400
DE =√400 = 20
x = DE {in Kite, diagonal AC bisect DB. DE = EB}
x = 20
DC² = DE² + EC² = 20² + 99 ² = 400 + 9801 = 10201
DC = √10201 = 101
y =101
In Kite, adjacent sides are equal.
AD = AB = 29
CD = CB = 101
Perimeter = 29 + 29 + 101 +101 = 260
the answer is D if it is not then try A
1512
18 times 21 times 8 = 3024
since it's a triangular prism, u half it
3024 div 2 = 1512
ace
320 cm³
none of the above
8 × 10 × 4
80 × 4
+ or - 0.044
