# Conversions, Formulas and When to Use Them

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What is the miles to kilometres conversion?

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### 17 Terms

1

What is the miles to kilometres conversion?

1 mile 1.6 km or 5 miles 8 km.

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2

What is the kilograms to pounds conversion?

1 kg 2.2 lbs.

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3

What is the litres to pints conversion?

1 litre 1.75 pints.

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4

When can you use the cosine rule?

When you are given 2 sides and the included angle or all 3 sides.

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5

What is the formula for calculating the frequency density? (histograms)

frequency density = frequency ÷ class width.

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6

What are the angles in a corresponding (F) angle?

Angles are equal (the same).

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7

What are the angles in an alternate (Z) angle?

Angles are equal (the same).

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8

What are the angles in an co-interior (C) angle?

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9

What are the bearing rules?

1. Always measure from North.

2. Always measure in a clockwise direction.

3. Always write three figures (e.g. 41° —> 041°).

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10

How do you find the acceleration on a velocity-time graph?

Find the gradient of a line (tangent).

To do this - draw line touching the curve. From this, draw right angle triangle and calculate using rise÷run.

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11

How do you find the distance travelled using a velocity time graph?

Find the area under the curve, usually using the trapezium rule.

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12

How do you find the area of a trapezium?

(a+b ÷ 2) x h.

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13

What should your standard form number be between?

1-10 (e.g. 17 × 106 —> 1.7 x 107).

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14

What is random sampling?

All data that has equal chance of being selected. For example, picking names out of a hat.

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15

What is systematic sampling?

Choosing the sample based on the position. For example, choosing every 10th person.

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16

What is stratified sampling?

Where the size of the sample is selected based on the proportion of different groups.

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17

How can you tell if one of two shapes is an enlargement of the other?

The angles are identical.

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