"Acute Angle Trigonometric Functions" PPT Courseware 4

Description

"Acute Angle Trigonometric Functions" PPT Courseware 4

1. As shown in the figure, in Rt△ABC, ∠C=90°, we call the ratio of the opposite side of ∠A to ________ as the tangent of ∠A, and record it as tan A, that is, tan A=the opposite side of ∠A/ ∠The adjacent side of A = ab.

2. tan 30°=________,

tan 45°=________,

tan 60°=________．

1. (3 points) In Rt△ABC, ∠C=90°, AB=5, BC=1, then tan B=________.

2. (3 points) In Rt△ABC, ∠C=90°, CD⊥AB, and the vertical foot is D. If CD=18, AD=24, then tan B=________.

3. (3 points) In Rt△ABC, ∠C=90°, tan A=2/3, AC=4, then BC is equal to ()

A.8/3　B． 2C． 1　D.7/3

4. (3 points) The position of the triangle on the graph paper is as shown in the figure, then the value of tan α is ()

A.3/4 B.4/3

C.3/5 D.4/5

18. (12 points) As shown in the figure, in the rectangle ABCD, E is a point on the edge of BC, AE=BC, DF⊥AE, the vertical foot is F, and it connects DE.

(1) Verify: AB=DF;

(2) If AD=10, AB=6, find the value of tan ∠EDF.

(1) Prove that △EAB≌△ADF and get AB=DF

(2) In Rt△ABE, BE=√AE2-AB2=8,

∵△EAB≌△ADF, ∴DF＝AB＝6, AF＝EB＝8,

∴EF=AE-AF=2,

∴tan ∠EDF＝EFDF＝13

19． (10 points) As shown in the figure, in Rt△ABC, ∠C=90°, D is the midpoint of BC, DE⊥AB is at point E, tan B=1/2, AE=6, find the length of DE.

Keywords: acute angle trigonometric function teaching courseware, Hebei Education Edition ninth grade mathematics volume PPT courseware download, ninth grade mathematics slide courseware download, acute angle trigonometric function PPT courseware download, .PPT format;

For more information about the "Acute Angle Trigonometric Functions" PPT courseware, please click on the Acute Angle Trigonometric Functions ppt tab.

"Applications of Acute Angle Trigonometric Functions" PPT courseware:

"Applications of Acute Trigonometric Functions" PPT courseware review and thinking about the relationship between the sides and angles of a right triangle. The relationship between the three sides of a right triangle: Pythagorean theorem a2+b2=c2. The relationship between the two acute angles of a right triangle: the two acute angles are mutually supplementary A+ B=900. Between the sides and angles of a right triangle...

"Calculation of Acute Angle Trigonometric Functions" PPT courseware:

"Calculation of Acute Angle Trigonometric Functions" PPT courseware 1. To use a calculator to find the value of an acute angle trigonometric function, you generally need to press the trigonometric function name key first, then enter the degree, use the degrees minutes and seconds keys to distinguish the degree unit, and finally press the = key. For example: use a calculator to find the value of cos 10. Press the keys in sequence. .

"Acute Angle Trigonometric Functions" PPT courseware 5:

"Trigonometric Functions of Acute Angles" PPT Courseware 5 1. As shown in the figure, in Rt△ABC, C=90, we call the ratio of the opposite side of the acute angle A to _________ as the ________ of A, which is recorded as sin A, that is, sin A=the opposite side of A ( ) = ac, The ratio of the adjacent side of acute angle A to ________ is called...

File Info

Update Time: 2024-09-08

This template belongs to Mathematics courseware Hebei Education Edition Ninth Grade Mathematics Volume 1 industry PPT template

Preview