Answer:
90cm2
Step-by-step explanation:
1/2x base x height.
1/2 x10 x 18
90cm2
I'm not quite sure but I'd say 1 and 4.
Answer:
Last Option
Step-by-step explanation:
We have a triangle and we know its three sides.
We want to find one of your anguos. Then we use the cosine theorem.

Where

Now we solve for x from the equation

Answer:
sample 1: 75
sample 2: 86
Step-by-step explanation: