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C2 Jan 2008 Figure 1

C. N.  . B. 700 m. 500 m. 15 . A. C2 Jan 2008 Figure 1. Figure 1 shows 3 yachts A , B and C which are assumed to be in the same horizontal plane. Yacht  B is 500 m due north of yacht A and yacht C is 700 m from A . The bearing of C from A is 015  .

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C2 Jan 2008 Figure 1

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  1. C N  B 700 m 500 m 15 A C2 Jan 2008 Figure 1 Figure 1 shows 3 yachts A, B and C which are assumed to be in the same horizontal plane. Yacht B is 500 m due north of yacht A and yacht C is 700 m from A. The bearing of C from A is 015. (a) Calculate the distance between yacht B and yacht C, in metres to 3 significant figures. (3) The bearing of yacht C from yacht B is , as shown in Figure 1. (b) Calculate the value of  . (4)

  2. Area of a triangle We can find the area of a triangle easily using ½ x base x height However, what if you don’t have the height? a b 400

  3. Area We use the formula Area of triangle = ½ ab Sin C We MUST have an included angle b 400 a

  4. example 4.2cm 750 6.9cm

  5. Example 2 The area of this triangle is 12cm2. Find the value of x x 6cm 5cm

  6. Example 3 Find the total area 3.9cm 4.8cm 750 2.4cm

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