sorry i just want some points :)
Answer:
The 1st one .
Step-by-step explanation:
Answer:
121
Step-by-step explanation:
I hope this helps you
121=11.11
a^2-11^2
(a-11). (a+11)
a.a+11a-11a-11.11
a^2+0-121
a^2-121
If you have
2 KNOWN sides & 1 Angle ;
Use Cosine Rule
If you have 3 KNOWN sides,
Also Cosine Rule
If you have
2 KNOWN angles & 1 side,
Use SINE rule
If it's a right-angled triangle, use SOH CAH TOA
Hopefully this helps
