Give you some math exercises.

The seventh grade math unit test (Part II) (Chapter V Triangle)

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1. Fill in the blank: (3 points for each blank, ***33 points)

1. A carpenter has two pieces of wood, the lengths of which are 80cm and 150cm respectively. He wants to find the third piece of wood and nail them into a triangular frame. There are four pieces of wood with lengths of 70cm,105cm, 200m and 300m respectively. He can choose a length of.

2. As shown in figure 1, AB‖CE, ∠C=370, ∠A= 1 150, then ∠F= degrees;

3. In △ABC, if ∠A+∠B=5∠C, ∠C= degrees;

4. As shown in Figure 3:

(1) In △ABC, the height of the side of BC is;

(2) In △AEC, the height of AE side is:

(3) In △FEC, the height on the side of EC is:

5. As shown in Figure 5, ∠3=∠4 is known, and △ ABC △ DCB needs to be explained.

(1) If it is based on "SAS", you need to add a condition:

(2) If it is based on "AAS", a condition needs to be added.

(3) If "ASA" is used as the basis, you need to add a condition.

6. As shown in Figure 4, △ ABC △ AED, ∠C=400, ∠EAC=300, ∠B=300, then ∠D=, ∠ EAD =;

Second, multiple-choice questions: (4 points for each small question, *** 12 points)

1, any triangle is divided into two triangles by a middle line, then these two triangles

① Same shape, ② Same area, ③ Consistent;

The above statement is correct ()

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