## Sunday, May 13, 2007

### Question 2

Susan is making a jump to ride her bike over. She uses a 1m plank of wood to make the jump, and raises the end 50 cm off the ground with a second piece of wood. How far along the ground from the end of the plank that touches the ground is the second piece of wood?

Formula

Picture

## Thursday, May 10, 2007

### Finding "B"

FINDING B
FINDING B
FINDING B
FINDING B
FINDING B
FINDING B
FINDING B

SINCE ADDING SIDE A AND SIDE B GIVES YOU SIDE C, TAKE AWAY SIDE A FROM SIDE C TO GET SIDE B

OR

C² - A² = B²

WITH THAT YOU CAN THIS:

C² - A² = B²...FORMULA
10² - 6² = B²...REPLACE A & C
(10X10) - (6X6) = B²...SQUARE A & C
100 - 36 = B²
64 = B²...SUBTRACT

YOU ARE NOT DONE YET. YOU FIVE B², YOU ARE LOOKING FOR B. YOU STILL HAVE TO FIND THE SQUARE ROOT OF YOUR ANSWER TO FIND B.

THE SQUARE ROOT OF 64 IS 8 (8X8=64).

B = 8

### Scribe post

Finding C

One of the most famous mathematicians who has ever lived, Pythagoras, a Greek scholar who lived way back in the 6th century B.C. (back when Bob Dole was learning geometry), came up with one of the most famous theorems ever, the Pythagorean Theorem. It says - in a right triangle, the square of the measure of the hypotenuse equals the sum of the squares of the measures of the two legs. This theorem is normally represented by the following equation: a2 + b2 = c2, where c represents the hypotenuse.

With this theorem, if you are given the measures of two sides of a triangle, you can easily find the measure of the other side.

Example

1. Problem: Find the value of c.

Accompanying Figure

Solution: a2 + b2 = c2 Write the Pythagorean
Theorem and then plug in any
given information.

52 + 122 = c2 The information that was
given in the figure was
plugged in.

169 = c2 Solve for c By finding the square root of the number
c = 13

2. Problem: A ladder 12 meters long leans
against a building. It rests on
the wall at a point 10 meters
above the ground. Find the angle
the ladder makes with the ground.

Solution: Make sure you know what is being
information to draw and label a
figure.

a2+b2=c
12,2+10,2=c
c2=144+100
c=244
square root of 244 is 15.62
c=15.62