Answer:
-3
Step-by-step explanation:

We know that

because of the Pythagorean trig identity

.
Answer:
The area is 72 cm².
Step-by-step explanation:
Since it is equivalent triangle
h = b
so,
b + b + b (since all sides are equal)= 36 cm
3b = 36 cm
or, b = 36/3
so, b = 12 cm
so
area of triangle = (1/2)×b×h
= (1/2)×12cm×12cm
= 6cm × 12cm
= 72 cm²
Answer: 40
Step-by-step explanation:
138/x = 207/60
8280 = 207x
divide by 207
40 = x