5 Fill in the blanks in mathematics

You mistyped several questions, and I have corrected them:

Fill in the blanks.

The two sides of the (1) angle are in a straight line. Such an angle is called a (flat) angle, which has (180) degrees and is equal to (2) right angles.

(2) The triangle has a base length of 6 cm and an area of 15 cm2. The base height of this triangle is (5) cm.

(3) Make the largest square with a 24 cm long iron wire, and the circumference of this square is (24 cm).

(4) When the perimeters of a rectangle and a square are equal, the square has a larger area.

(5) Put two cubes with a side length of 3cm together to form a cuboid. This cuboid has a surface area of 90 square centimeters and a volume of 54 cubic centimeters.

(6) Write the number of symmetry axes of the following figures.

Rectangular (2) Square (4) Circle (countless)

Regular triangle (3) isosceles triangle (1) semicircle (1)

Parallelogram (0) trapezoid (0) isosceles trapezoid (1)

(7) The top angle of an isosceles triangle is 70 degrees, and one of its bottom angles is (55 degrees); If one of its base angles is 50 degrees, its top angle is (80 degrees).

(8)70.002 cubic meters =(70002) cubic decimeter =(70002000) cubic centimeter.

600 liters = 600 cubic decimeters = 0.6 cubic meters.

9.08 cubic decimeter =(9.08) liter =(9080) ml.

4.07 cubic meters = 4 cubic meters and 70 cubic decimeters.

7.8 l =(7800) ml for 40 minutes (2/3)

1020 cubic decimeter =( 1.02) cubic meter 0.7 square meter =(700) square decimeter.

(9) A cube pool with a side length of 5 decimeters has a water level 2 decimeters lower than that of the pool mouth, and the accumulated water capacity is (75) liters.

(10) Dig a cuboid vegetable hole with a length and width of 5 meters each. To make the volume of the vegetable pit reach 50 cubic meters, it is necessary to dig (2 meters) deep.

(1 1) A rectangular goldfish bowl, with a length of 8 decimeters, a width of 5 decimeters and a height of 6 decimeters, was accidentally broken in front of the glass, and the glass area for repair was (48) square decimeters.

(12) For a rectangular iron box with a length of 10cm, a width of 8cm and a height of 5cm, write a formula according to the problem and calculate:

(1) Find the area of the upper and lower bottom surfaces:

10×8=80(cm？ )

(2) area of front and rear sides:

10×5=50(cm？ )

(3) the area of the left and right sides:

8×5=40(cm？ )

(4) Area of four walls:

10×5+8×5=90(cm？ )

(5) Sum of side lengths:

(10+8+5)×4=92 (cm)

(6) Its surface area: