Extension C2 trig need help please

Please help me with questions
the questions are extensions from rosemary as edexcel book.
I need help with question 5
In relation to q5, can some one please explain what I am suoppose to do
thanks.

Please can someone help me with q11 as well. Please give me guidance I cant find the appropriate angle

Thank you very much.

Attachment not found

Original post by bigmansouf

Please help me with questions
the questions are extensions from rosemary as edexcel book.
I need help with question 5
In relation to q5, can some one please explain what I am suoppose to do
thanks.

Please can someone help me with q11 as well. Please give me guidance I cant find the appropriate angle

Thank you very much.

Attachment not found

Do you want a worked solution or a hint?

Reply 2

JT4NG56

4

Original post by bigmansouf

Please help me with questions
the questions are extensions from rosemary as edexcel book.
I need help with question 5
In relation to q5, can some one please explain what I am suoppose to do
thanks.

Please can someone help me with q11 as well. Please give me guidance I cant find the appropriate angle

Thank you very much.

Attachment not found

The start of an approach to question 5:

Spoiler

Should be enough of a hint.

The start of an approach to question 11:

Spoiler

Accidentally labelled this question 1a :/

Don't forget to +Rep if it helped.

Reply 3

bigmansouf

OP

20

Original post by JT4NG56

The start of an approach to question 5:

Spoiler

Should be enough of a hint.

The start of an approach to question 11:

Spoiler

Accidentally labelled this question 1a :/

Don't forget to +Rep if it helped.

thanks very much I will report back on how I get on with the question

Reply 4

bigmansouf

OP

20

sorry may I ask in your first pic. you wrote down prep height what does it mean?
thanks

Reply 5

JT4NG56

4

Original post by bigmansouf

sorry may I ask in your first pic. you wrote down prep height what does it mean?
thanks

Perpendicular height of the equilateral triangles. Say you have a equilateral triangle with length 4. To find the perpendicular height, length^2 - (half of length)^2. Pythagoras. Then you can work on the area of the equilateral triangle by doing perpendicular height * length * 0.5.