mickimlvn6128
08.05.2021 •
Mathematics
Question
А
7. A bug travels up a tree, from the ground, over a 30-second interval. It travels fast as first
and then slows down. It stops for 10 seconds, then proceeds
slowly, speeding up as it goes.
Which sketch best illustrates the bug's distance (d) from the ground over the 30-second
interval (t)?
с
D
E
(1)
(3)
Question 7
Vu
LS
D
(2)
(4)
a) 1
b) 2
c) 3
d) 4
Solved
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Ответ:
if angle A=45°
then
angle C is also 45°
therefore
if BC=6
AB is also 6
applying the Pythagorean theorem
AC²=AB²+BC²--------> AC²=6²+6²------> AC²=72------> AC=6√2
cos 45=6/(6√2)--------> cos 45=1/√2
the answer is the option B
cos 45=1/√2