ABC and ACD are triangles
a) Show that AC=11.4cm, correct to 3 significant figures.

17² + 13² - 2 × 17 × 13 × COS(42) = 11.38112416

AC = 11.38112416 correct to 3 significant figures = 11.4cm

Thanks for helping me on part B :)

Step-by-step explanation:

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step-by-step explanation:

in the math equation 8 x 7 = 56, the 8 and the 7 are both factors of 56, since in this lesson we will use square tiles to figure out the factors of a whole find as many different arrays as you can, but follow one important rule: all the rows must have the i can make two rows of nine, so 2 and 9 are both factors of 18.

step-by-step explanation: