LESSON THIRTIETH.
MEASUREMENT OF SURFACES.
In Fig. 1 (Diagram [23].) call the line a b a unit.
Rectangle 1 is how many units long?
How many high?
Because its sides are equal, what is it called?
Rectangle 2 is how many units long?
How many high or wide?
How many squares does it contain?
Rectangle 3 is how many units long?
How many wide?
How many squares does it contain?
If it were four units long and one wide, how many squares would it contain?
If it were five long and one wide? Six long? &c.
Rectangle 4 is how many units long?
How many wide?
How many squares does it contain?
How many squares in that part which is two units long, m n, and one unit wide, m l?
On account of the second unit in width, l k, how many times two squares are there?
If the width were one unit more, how many times two squares would there be?
Rectangle 5 is how many units long?
How many units wide or high?
How many squares does it contain?
How many squares in that part which is three units long, o p, and one unit wide, o t?
The second unit in width, t q, gives how many more squares? How many times three squares?
If another unit were added to the width, how many more squares would be made?
How many times three squares?
If it were four units wide, how many times three squares would there be?
Rectangle 6 is how many units long?
How many units high or wide?
How many squares in that part which is four units long and one high?
How many times four squares in that part which is four long and two high?
How many times four squares when it is four long and three high?
If another unit were added to the height, how many more squares would be added?
How many times four squares would there be?
If a rectangle were five units long and one unit wide, how many square units would it contain?
If it were two units wide, how many times five square units would it contain?
If it were three units wide? Four? &c.
If your ruler is ten inches long and only one inch wide, how many square inches are there in it?
If it were two inches wide, how many times ten square inches would it contain?
If your arithmetic-cover is seven inches long and five inches wide, how many square inches are there in it?
If a wall of this room is twenty feet long, how many square feet are there in that part which is one foot high? Two high? Three high? Four high?
If the same wall is sixteen feet high, how many square feet in it?
Fig. 5 has how many times three squares?
Fig. 7 has how many times two squares?
Which has the greater number of squares?
What difference is there between two times three squares and three times two squares?
