Confusing questions

Watch
#1
Here:
0
#2
0
#3
I don't know what do do first.
0
1 year ago
#4
180 degrees in a triangle
180-90=90
Two other angles add to 90
4:1 so there are five parts
90/5=18
18*4=72. Angle B
18*1 =18 Angle A

To find BC do trig

Then to find AB do Pythagoras

(Original post by Steve445)
I don't know what do do first.
Last edited by humphreyseuan19; 1 year ago
0
1 year ago
#5
(Original post by humphreyseuan19)
180 degrees in a triangle
180-90=90
Two other angles add to 90
4:1 so there are five parts
90/5=18
18*4=72. Angle B
18*1 =18 Angle A

To find BC do trig

Then to find AB do Pythagoras
No need to find BC, just use trig to find AB directly (after you've worked out the angle)
1
#6

Okay, have I done it correct?
0
1 year ago
#7
No, 52 is way too large, just look at the triangle.
In tan, you divide an angle by a length .which is wrong.
Just use
cos(18)
0
#8
(Original post by mqb2766)
No, 52 is way too large, just look at the triangle.
In tan, you divide an angle by a length .which is wrong.
Just use
cos(18)
So just using cos(18) will get me the answer, right?
0
1 year ago
#9
Share 90 in the ratio 1:4
90/5=18
angle x=18
Use the function Cosine because you want to find the hypotenuse and have the adjacent
Cos(18)=14/h
hypotenuse=14/Cos(18)
I don't have a calculator on me but I think that's what you do
Hope this helped
Last edited by Lala143; 1 year ago
0
1 year ago
#10
Just checked on my calculator: it's 14.7204 but in 3 sig. fig. it is 14.7
0
X

new posts
Back
to top
Latest
My Feed

Oops, nobody has postedin the last few hours.

Why not re-start the conversation?

see more

See more of what you like onThe Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Poll

Join the discussion

Yes (99)
22.45%
No (342)
77.55%