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Non Right Angled
Triangles
+ area of a triangle =
½ x base x perp. height
C
½ x base x perp. height
h
e
a b
i
g h = b x SinA
h
t
B C A
base…read more

Slide 3

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C
Non Right Angled
a b Triangles
B
C
A + the sine rule
Finding a Side;
#1 Find the pairs
50 and 140°
140° x and 30 °
#2 Fill in the Sine Rule
x
30°
x = 50
sin30 sin140
50cm
#3 Re-arrange so x=...
x = 50 x sin30 = 38.9cm
a sin140…read more

Slide 4

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C
Non Right Angled
a b Triangles
+ the sine rule
B
Finding an Angle;
C
A
#1 Find the pairs
50 and 160°
40 and x °
#2 Fill in the Sine Rule
sinX =
160° sin160
40
40 50
x° #3 Re-arrange so x=...
50cm x = sin160 x 40 = 0.273616114
50
#4 Times by sin-1
sin-1 0.273616114 = 15.9…read more

Slide 5

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C
Non Right Angled
a b Triangles
B
C
A + the cosine rule
b2 = a2 + c2 - 2ac x cosB
Finding a Side;
x
x2 = 112 + 122 - 2 x 11 x 12 x cos30
12cm
30° 1cm
x2 = 36.37....
1
x2 = x = 6.03cm…read more

Slide 6

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Right Angled Triangles
SOHCAHTO
A
Some Officers Have…read more

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