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Answer:
area = 82.5 cm.
Step-by-step explanation:
let:
A = Area,
b = diagonal 1,
c = diagonal 2,
k = constant
formula of joint variation:
y = kxz
so, A = kbc
To find the area, find the constant first by subsituting the given values.
40 = k (10)(8)
^ ^ ^
A b c
= 40 = 80k
= 40/80 = k
= k = ½
Then, use the constant k to find the Area.
A = ½ (11)(15)
= ½(165)
A = 82.5 cm.