Maths question

[troppibambini]

Hi can anyone help me with dds maths homework?
She's struggling and I haven't got a clue!

Shameless bump!!

Cos62 x 12 = 8.1cm

Cos 62 x 12 = the length AB

It's Pythagoras Theorem for right angled triangles - google should be able to help. Need a scientific calculator (or google)!

Thank that's what she put and it's coming up wrong.
I'm wondering if there is a problem with question perhaps.

Sorry should say it's online homework.

It's to do with Soh cah toa (sin, cos, tan)

You are working with adjacent and hypotenusr so need to use cos
Cos (of the angle) = adjacent/hypotenuse so

Adjacent = cos 62 x hypotenuse
A = cos 62 x 12

Havent got a calculator to get the answer

Cos 63 is 0.6735

I googled it.

Soz, cos 62 that should say!

Calculator needs to be in degree mode not radians - check for a small D top of display just right of centre. Better to do 12 x Cos62 so the 12 doesn't end up in Cos bracket

Thanks very much both the answers are coming up wrong which is completely confusing her.

What us her answer I will check

Should be 5.6cm

Thank you @woodlands01 you were right online calculator was in the wrong mode!!!
Correct answer 5.6
Happy dd she's good at maths and was really starting to doubt herself.

Is she remembering to put the decimal place? And the value (cm)?

XPost @woodlands01 thanks again.

Glad it's sorted!

You need to use SohCahToa

You know the hypotenu (12), and are trying to find the ajacent side (AB), so the relevant bit is 'Cah'

That means the cosine of the angels is adjacent over hypotenu.

Or cos(62)= AB / 12

Rearrange it to AB = cos(62) x 12

AB = 5.6

I was going to ask whether degrees or radians were used

I am dreading this ... I can’t do my 9yo homework!