Answer:
see explanation
Step-by-step explanation:
Since the triangles are similar then the ratios of corresponding sides are equal
(a)
= 
, substitute values
= 
( cross- multiply )
7.2XZ = 117 ( divide both sides by 7.2 )
XZ = 16.25 cm
---------------------------------------
(b)
= , substitute values
= ( cross- multiply )
18QR = 122.4 ( divide both sides by 18 )
QR = 6.8 cm
Hi, What grade is this?
I am currently doing flvs too and could help you out.
Answer:
The correct answer is D
Step-by-step explanation:
Formatted Options:
A. sin²A−cos²A
B. sin²A+cos²A
C. cos²A−sin²A
D. cosA−sinA
Answer:
C. cos²A−sin²A
Step-by-step explanation:
From the double angle formulas, we know that:
cos (A + B) = cosAcosB - sinAsinB
So, if B = A, then the above equation becomes;
cos(A + A) = cosAcosA - sinAsinA [i.e replacing B with A]
=>cos(2A) = (cosA)² - (sinA)²
=> cos(2A) = cos²A - sin²A
Therefore,
cos(2A) is equivalent to cos²A - sin²A
The 1,4 triangle and the 2,8 triangle so the one on the bottom of A and to the right of it
