2 Answers

Salih · Answer 1 · 2022-08-30T06:25:25+0000

Answer:

A

Explanation:

Distance between 2 points

$= \sqrt{(x1 - x2)^(2) + (y1 - y2)^(2) }$

☆ (x₁, y₁) is the first coordinate while (x₂, y₂) I'd the second coordinate.

Length of RS

$= \sqrt{ {[ - 1 -( - 4)] }^(2) + (9 - 1)^(2) } \\ = \sqrt{( - 1 + 4)^(2) + 8^(2) } \\ = \sqrt{ {3}^(2) + 64 } \\ = √(73) \\ = 8.54 \: (3 \: s.f.)$

Thus, RS is about 8.5 units.

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