Help urgent maths

Help I don’t get why it’s sin-1 (0.6/0.8)
Sin is soh
S= O/A
And the opposite length is root 7 over 5
Because hyp squared minus adj squared… then square root ans.
How’s it the stuff on the ms plz explain

(edited 10 months ago)

Reply 1

mqb2766

Theyve worked out the complementary angle, so the angle with the horizontal, and its ~49 and 41+49=90 as youd expect.

Reply 2

Alevelhelp.1

Original post by mqb2766

Theyve worked out the complementary angle, so the angle with the horizontal, and its ~49 and 41+49=90 as youd expect.

But why have they worked that angle out… how am I supposed to know to do that in my exam??

(edited 10 months ago)

Reply 3

davros

Original post by Alevelhelp.1

But why have they worked that angle out… how am I supposed to know to do that in my exam??

The mark scheme says "Accept complementary angles" so as long as you resolve forces correctly it shouldn't matter to the final answer :smile:

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