You would have no problem at all if it said "7 cows minus 2 cows", or "7 books minus 2 books". The THINGS just happen to be m's instead of cows or books.
Important notes:
3 sides 1 angle - COSINE RULE
2 sides 2 angle - SINE RULE
since, the question wants to find the length of BC. In the end we will have 3 sides and 1 angle and use cosine rule
formula of cosine rule:
a² = b² + c² - 2bc Cos A° (to find the length)
Cos A° = b² + c² - a² / 2bc ( to find the angle, if there is given three sides and have to find the angle)
So just substitute,
a² = 13² + 15² - 2(13)(15) Cos 95°
a = 20.6 or 21
This would be.
-23√6 all over 6.
Or: around -9.39
Answer:
ab - b^2
Step-by-step explanation:
The area of the large rectangle is
A = l*w
=a*b
The area of the unshaded region is
A = b*b = b^2
The area of the shaded region is the area of the rectangle minus the area of the unshaded region
ab - b^2
