## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with areas

### What fraction of the square is the pink triangle?

April27

Using your knowledge of Areas, work out what fraction the pink triangle is of the square (answer soon in post support):

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### You need to build a pen for your dog…

September29

‘Sadie’ is such a lovely dog – playful, cuddly and, well, just cute! But, your parents are going out to buy 24 meters of fencing to make a pen for dear Sadie. What will you do while they are out shopping? Why, play with Sadie of course? No, no, no – you have to put […]

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### Areas Game helps Math understanding

August23

A great little game for 2 or 3 players and easy to organise in the classroom! Each player chooses a colour pencil or pen/highlighter they will use in the game. Players take turns rolling the dice, using the numbers that they rolled to draw the perimeter of a rectangle or square & writing the area […]

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### Circle Area

May28

As we saw in the last posting, the area of a circle is given by; So, to find the area of a circle we multiply pi (3.1415…) x the radius squared. Our answer will be something squared. Another way to think of area is how many square tiles would fit the shape, etc. In the […]

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### Finding Areas – a Quick Summary

May27

Here are the most common areas which students are required to calculate. Note that areas are ALWAYS expressed as something squared (such as squared metres):

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### Find the Value of X (diagram not to scale)

February2

No suggested solutions yet!

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#### Post Support

NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]